The protonema is a stage of the gametophyte that develops directly from a haploid spore. Therefore, the ploidy of a protonemal cell is haploid (n).
Question 32 of 100
📘 CLASS XI
Red algae usually reproduce asexually by ________ and sexually by ________.
The red algae reproduce asexually by non-motile spores and sexually by non-motile gametes, as flagella are entirely absent in Rhodophyceae.
Question 33 of 100
📘 CLASS XI
Dryopteris, Pteris, and Adiantum belong to which class of pteridophytes?
The pteridophytes are further classified into four classes. Dryopteris, Pteris, and Adiantum fall under Pteropsida.
Question 34 of 100
📘 CLASS XI
In mosses, spores are formed inside the capsule after:
The sporophyte in mosses consists of a foot, seta, and capsule. The capsule contains spores, which are formed after meiosis.
Question 35 of 100
📘 CLASS XI
A form of sexual reproduction involving fusion between one large, non-motile female gamete and a smaller, motile male gamete is called:
Oogamous reproduction involves the fusion between one large, non-motile (static) female gamete and a smaller, motile male gamete, e.g., Volvox, Fucus.
Question 36 of 100
📘 CLASS XI
In pteridophytes, the sporangia produce spores by meiosis in:
In pteridophytes, the sporangia produce spores by meiosis in spore mother cells.
Question 37 of 100
📘 CLASS XI
In mosses, the sex organs (antheridia and archegonia) are produced at the:
In sexual reproduction of mosses, the sex organs antheridia and archegonia are produced at the apex of the leafy shoots.
Question 38 of 100
📘 CLASS XI
The nucellus in gymnosperms is protected by envelopes and the composite structure is called a(n):
In gymnosperms, the megaspore mother cell is differentiated from one of the cells of the nucellus. The nucellus is protected by envelopes and the composite structure is called an ovule.
Question 39 of 100
📘 CLASS XI
Cyanobacteria, commonly referred to as blue-green algae, are no longer considered algae because:
Members of Monera and Protista having cell walls have now been excluded from Plantae. So, cyanobacteria (blue-green algae) are not considered 'algae' anymore.
Question 40 of 100
📘 CLASS XI
Agar, one of the commercial products used to grow microbes, is obtained from:
Agar is a commercial product obtained from the red algae Gelidium and Gracilaria and is used to grow microbes and in preparations of ice-creams and jellies.
